346 



J. J. SKINNER 



observations had shown in addition to the harmful effect of the 

 sesame soil on cabbages, that soil in different rows of the same 

 field in which sesame had not grown, cabbages grew well. The 

 observation is of interest in showing that plants can be affected 

 by the remains of previous vegetation or previous plant growth 

 and also that such effects can be more or less specific, affecting 

 one kind of plant whereas another kind of plant is practically 

 unaffected. 



